Helium Help - Create Thread button too dark to see text content.

Been using your Helium style the last 2 weeks and it's been great - thank you.
A few things though with the text and background of the Create New Thread button - it's too dark to read and is out of step with the rest of the style.

the best example I can show you is the front page of my current working site : Bali Forums . com

The button on the far right, after 'New Posts', has no text visible.
I can see where to change it in 'Appearances' within the Admin panel of XenForo, but the style won't allow me to change it. I get an 'Oops' error each time.
Similarly, when I attempt to use Smilies anywhere in any post, I get the same 'Oops' error. If I take the Smilies out of the post and try again, I can post OK.